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Multiple Choice questions on Electric current resistance and resistivity for Jee Main and Advanced






Assertion and Reason Type Question
Following question consider two statements one labelled as statement-1 and another as statement-2. Study both statements and mark your answer using the codes given blow.
  1. Both Statement-1 and Statement-2 are true and Statement-2 is correct explanation of Statement-1.
  2.  Both Statement-1 and Statement-2 are true and Statement-2 is not a correct explanation of Statement-1.
  3. Statement-1 is true but statement-2 is false.
  4. Statement-1 is false and statement-2 is true.
Question-1
Statement-1 Free electrons in conductor are always in state of continuous random motion.
Statement-2 The random motion of free electrons is due to thermal energy of the conductor.
Question-2
Statement-1 Drift velocity of electrons in a conductor increase on increasing the temperature of the conductor.
Statement-2 On increasing the temperature of a conductor, resistivity of the conductor increases.
Question-3
Statement-1 For metals relaxation time for electrons decreases with increase in temperature.
Statement-2 With the increase in temperature, number of collision per unit time that electrons made with lattice ion also increases.

Multiple Choice Type Questions


Question-4
Resistivity of the material of a conductor having uniform area of cross-section varies along its length according to the relation
ρ= ρ0 (a+bx)
if L is the length of the conductor and be the area of cross-section then resistivity of the conductor given by relation
Multiple Choice questions on Electric current resistance and resistivity for Jee Main and Advanced

Question-5
Given a current carrying wire of non-uniform cross-section. Which of the following is constant through out the wire.
(A) Current only                                                            
(B) Current and drift speed
(C) Drift speed only                                                                   
(D) Current, drift speed and electric field

Question-6
When potential difference across a given copper wire is increase, drift velocity of charge carriers
(A) Decreases                                                                          
(B) Increases
(C) Remain same                                                                     
(D) Get reduced to zero


Question-7
A material B has twice the specific resistance of the material A. A circular wire made of B has twice the diameter of the wire made of A. Then , for the two wires to have to have the same resistance, the ratio
La/Lb of their respective lengths must be
(A) ½                                                                                       
(B) 2
(C) ¼                                                                                       
(D) 1

Question-8
What will be the equivalent resistance between A and D
Multiple Choice questions on Electric current resistance and resistivity for Jee Main and Advanced
(A) 40  Ω                                                                    
(B) 20Ω
(C) 30   Ω                                                                   
(D) 10Ω

 
Question-9
In the given circuit below the equivalent resistance between points A and C
Multiple Choice questions on Electric current resistance and resistivity for Jee Main and Advanced
(A) 32                                                                          
(B) 30.7
(C) 33.07                                                                      
(D) 3.07

Question-10
A circular ring having negligible resistance is used to connect four resistors as shown below in the figure.
The equivalent resistance between point A and B is
Multiple Choice questions on Electric current resistance and resistivity for Jee Main and Advanced
(A) 10R                                                            
(B) 2R
(C) 3R                                                                         
(D) R



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